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FRED CLAYTON, OF STRINES, ENGLAND, ASSIGNOR TO JAMES JONES MELDRUM, THOMAS FREDERICK MELDRUM, AND JOHN WESLEY MELDRUM, OF MANCHESTER, ENGLAND.

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SPECFIGATION forming part of Letters Patent No. 655,759, dated August 14, 1900. Application filed December 28, 1897. Serial No. 664,025. (No model.)

To all whom it may concern:

Be it known that I, FRED CLAYTON, a subject of the Queen of England, and a resident of Strines, England, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

This invention has reference to furnaces having moving firebars mechanically operated.

The invention is illustrated in the annexed drawings.

In the drawings, Figures l and 2 illustrate the formation of the'ends of two adjacent iire-bars detached; and Figs. 3, 4, LLA, 4B, and 4C show the same working together and in connection with cams, hereinafter described, the latter and the ends of the fire-bars being i so formed that only two cams are needed for each pair of fire-bars.

The two cams a and a', Figs. 3 to 4C, are fixed closely side by side or made in one piece and are threaded alternately upon the hexagonal or other suitably-shaped shaft c. (See Fig. l.) These cams work, respectively, in spaces or jaws CZ d', made in the ends of the two lire-bars, as shown in Figs. l to 1t, the different positions being more clearly shown in Figs. 4A, 4B, and 4:0. One cam d is in the form of a single ratchet, catching against one or two projections e c/ on its corresponding fire-bars f to move the same in one direction or the other. The second cam a' is in the form of a sector of a circle or is otherwise so formed that as the iirst cam d is draw-v ing its bar f outward it holds the second bar f in place by working against the curved part of the jaw, at the end of the same, should the outward motion of the first bar tend to draw it back, and while the first cam a is moving from one projection e to the other on the first bar f (see Figs. 4^., 4B, and 4C) the second cam alwithdraws the second bar f',

of said cams which is so formed with a recess at d3 that one side of the sector or cam a will catch against it at this part of the revolution of the cam-shaft. The first bar f is in some cases provided with a projection g, (see Fig. 3,) which when both bars are withdrawn bears against part of the outer end of the second bar f', so that as the former is pushed inward or forward by its cam it will carry the second bar with it; "but I do not claim this projection g as any part of my invention, for by making the cam a sufficiently wide, as shown in Fig. 4, the same cam a will act upon the lower jaws of both bars, and the projection g is therefore unnecessary.

What is claimed in respect of the hereindescribed invention isl. In a furnace having moving fire-bars, mechanically operated, the combination with a pair of fire-bars, of double cams, adapted to operate upon the end of the bars, and one v being in advance of the other, and the trailing cam adapted to act as a stop to its bar, while the other is in action and drawing its bar forward; substantially as set forth.

2. In a furnace having moving fire-bars mechanically operated, the combination of a pair of bars f f having jaws d d2, respectively, ,and the cams ay a in advance of each other, and adapted to act upon the bars f and f respectively, in succession, the cam a acting as a stop to its -bar while cam a is in action and drawing its bar forward; substantially as set forth.

In testimony whereof l have hereunto set 4 my hand in presence of two subscribing witnesses.

. FRED CLAYTON. "Witnesses:

WALTER HERBERT SWIFT, ROBERT CHANTLER. 

